I find this dubious unless the engine is run without an oil filter.  Also,
the first step to a proper engine assembly procedure is to thoroughly hot
scrub
all the components which includes using tube brushes in the lifter bores.
George
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I've run in many rebuilt VW engines on my test stand and in every case I had
a tea spoon full of metal shavings and debris in the strainer plate after
that first 20 minute run in at 2000 rpms.
I don't think this relates to getting the lifters filled with crud but the
material is certainly there.
I've had occasion to disassemble an engine right after the run in process
and you'd be surprised how much wear is put on the bearings during this
time.
Much of this wear is caused by abrasive particles small enough to escape the
filter process.

Stan Wilder
Engine Ceramics
214-352-4931
www.engineceramics.com